Table 2. Discriminant factors for distinguishing the intraoperative bleeding group from reference group.

Characteristics	Univariable logistics regression			Multivariable logistics regression
	OR (95% CI)	P value		OR (95% CI)	P value
Gender
Female	Reference
Male	1.002 (0.609–1.647)	0.995
Age
<60 years	Reference
≥60 years	1.486 (0.892–2.476)	0.128
Smoking history
No	Reference
Yes	1.223 (0.742–2.017)	0.429
History of chest disease
No	Reference
Yes	1.477 (0.652–3.347)	0.350
History of chest surgery
No	Reference			Reference
Yes	4.941 (2.038–11.975)	<0.001*		5.130 (2.047–12.853)	0.001*
Neoadjuvant therapy
No	Reference
Yes	1.455 (0.642–3.297)	0.369
Anticoagulant therapy
No	Reference
Yes	2.951 (0.983–8.858)	0.054
Position of tumor
Central type	Reference
Peripheral type	0.595 (0.316–1.122)	0.109
Location of tumor
Left	Reference
Right	0.656 (0.400–1.077)	0.096
Pleural adhesion
No	Reference
Yes	1.901 (1.123–3.219)	0.017*		1.553 (0.898–2.685)	0.115
Pathological type
Squamous	Reference			Reference
Non-squamous	0.534 (0.296–0.962)	0.037*		0.707 (0.375–1.335)	0.285
T stage
Tis–T1	Reference			Reference
T2–4	2.124 (1.291–3.496)	0.003*		2.014 (1.182–3.429)	0.010*
N stage
N0	Reference
N1–2	1.448 (0.834–2.516)	0.189

*, P<0.05. OR, odds ratio; CI, confidence interval; T, tumor; N, node.